Supplemented Data for: Towards automatizing detection and quantification of intestinal metaplasia: a multi-expert comparative study

Gastric samples from two independent cohorts. The first cohort consists of 149 asymptomatic volunteers who were selected from an independent study provided by the CIEDYN foundation, a partner of the Urkunina5000 project. This study performed an endoscopic and pathological characterization of gastric disease in 5.000 volunteers from 55 small villages in Nariño, Colombia, a region long observed as being GCa prevalent for the past two decades. Asymptomatic volunteers were men and women aged 30 − 70 years, who had lived in these areas for at least the last 10 years and had never undergone an endoscopy procedure, nor been diagnosed with GCa, any other type of cancer, or any known gastric pathology. The second cohort included 56 patients from the Hospital Universitario Nacional de Colombia included in a larger study which was approved by the ethics committee (Act No.007, Apr 29 2022). Patients were men and women who present symptoms suggestive of gastritis or other forms of gastric discomfort. However, none of them had a previous GCa diagnosis or any other type of lesion.